Designed for use with analog and digital satellite receivers, this single-channel low-noise step-down conversion regulator (LNBR) is a monolithic linear/switching regulator designed to transmit power and interface signals to an LNB buck converter over coaxial cable. The A8296 features a boost switch and compensation circuitry integrated into the device, eliminating the need for external components.
The A8296 design achieves high efficiency by leveraging Allegro's® advanced BCD process. Optimized for integrated boost switches to minimize switching and static losses. To further improve efficiency, voltage drops in the process of tracking regulators have been eliminated to a minimum.
For DiSEqC™ communication, a tone control pin is provided for strobe control of the internally generated 22 kHz tone switch.
The device provides a comprehensive set of fault registers that meet all common standards, including: overcurrent, overtemperature shutdown, undervoltage, and poor power supply. Additionally, the design approach and construction ensure the highest level of stability against transients and component failures.
The device uses a 2-wire bidirectional serial interface, is compatible with the I2C™ standard, and operates at up to 400 kHz.
The A8296 is available in a lead-free (Pb) package.
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集成升压 MOSFET、电流感应和补偿
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250 至 950 mA 的可调 LNB 输出电流限制
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可满足广泛的应用需求
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最紧凑的部件，可迎合各种应用
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用于启动、重新配置、及连续输出
（最大值取决于 PCB 散热设计）
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通过 LNB 电流
限制设置升压峰值电流限制水平
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8 级可编程 LNB 输出电压 (DAC)
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带关机计时器的 LNB 过流限制器
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跟踪升压转换器，减少功耗
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可由外部电容配置的 LNB 瞬变时间
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推拉 LNB 输出阶，即使在高电容负载的情况下也能维持 13→18 V 以及 18→13 V 瞬变时间
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内置 22 kHz 音调振荡器，有助于 DiSEqC™ 音调编码，甚至在无载荷时亦可实现
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无需额外的外部元件即可产生音调
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诊断功能：PNG
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广泛的保护功能：UVLO、OCP、TSD、CPOK
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2 线 I2C-兼容接口